Merge pull request #223666 from jpeng-ms/doc/case-update

[ACS Mobile UI] Updated Section Headers to Sentence Case

Author: jborsecnik

articles/communication-services/concepts/ui-library/includes/mobile-ui-library.md

@@ -13,48 +13,48 @@ ms.custom: kr2b-contr-experiment
 
 *Composites* are turn-key solutions that implement common communication scenarios. You can add video calling experiences to your applications. Composites are open-source higher-order components that developers can take advantage of to reduce development time and engineering complexity.
 
-## Composites Overview
+## Composites overview
 
 | Composite | Use Cases |
 | :-------- | :-------- |
 | [CallComposite](../../../quickstarts/ui-library/get-started-composites.md)  | Calling experience that allows users to start or join a call. Inside the experience, users can configure their devices, participate in the call with video, and see other participants, including those ones with video turned on. For Teams interoperability, `CallComposite` includes lobby functionality so that users can wait to be admitted. |
 | [ChatComposite](../../../quickstarts/ui-library/get-started-chat-ui-library.md)  | The `ChatComposite` brings a real-time text messaging experience to users. Specifically, users can send and receive a chat message with events from typing indicators and read receipt. In addition, users can also receive system messages such as participant added or removed and changes to chat title. |
 
-## Composites Scenarios for Calling
+## Composites scenarios for calling
 
-### Joining a Video/Audio Call
+### Joining a video/audio call
 
 Users can join a call using the *Teams meeting URL* or they can set up an Azure Communication Services Call. This approach offers a simpler experience, just like the Teams application.
 
 :::image type="content" source="../../media/mobile-ui/android-composite.gif" alt-text="Gif animation shows the pre-meeting experience and joining experience on Android.":::
 
-### Pre-call Experience
+### Pre-call experience
 
 As a participant of the call, you can provide a name and set up a default configuration for audio and video devices. Then you're ready to jump into the call.
 
 :::image type="content" source="../../media/mobile-ui/teams-meet.png" alt-text="Screenshot shows the pre-meeting experience, a page with a message for the participant.":::
 
-### Call Experience
+### Call experience
 
 The calling composite provides an end-to-end experience, optimizes development time, and focuses on clean layout.  
 
 :::image type="content" source="../../media/mobile-ui/calling-composite.png" alt-text="Screenshot shows the meeting experience, with icons or video of participants.":::
 
 The calling experience provides all these capabilities in one composite component, providing a clear path without complex code, which leads to faster development time.
 
-### Quality and Security
+### Quality and security
 
 Mobile composites for calling are initialized using [Azure Communication Services access tokens](../../../quickstarts/access-tokens.md).
 
-### More Details
+### More details
 
 If you need more details about mobile composites for calling, see [use cases](../ui-library-use-cases.md#calling-use-cases).
 
-## Composites Scenarios for Chat
+## Composites scenarios for chat
 
 [!INCLUDE [Public Preview Notice](../../../includes/public-preview-include.md)]
 
-### Chat Experience
+### Chat experience
 
 The `ChatComposite` delivers real time text messaging experiences. With the flexibility and scalability in mind, the `ChatComposite` can adapt to different layout or views from your applications without complexibility. You could also choose to not have the `ChatComposite` view shown and only receive notifications to meet your different business needs. 
 
@@ -63,11 +63,11 @@ The `ChatComposite` delivers real time text messaging experiences. With the flex
 | :::image type="content" source="../../media/mobile-ui/ios-chat-composite.gif" alt-text="Gif animation shows the chat experience on iOS."::: | :::image type="content" source="../../media/mobile-ui/android-chat-composite.gif" alt-text="Gif animation shows the chat experience on Android.":::  |
 
 
-### Quality and Security
+### Quality and security
 
 Similar to the `CallComposite`, the `ChatComposite` also utilizes [Azure Communication Services access tokens](../../../quickstarts/access-tokens.md). To ensure only users with appropriate permission can access chat, their user tokens need to be added into a valid [chat thread](../../../quickstarts/chat/get-started.md) prior to starting the Chat experience. 
 
-### More Details
+### More details
 
 If you need more details about mobile composites for chat, see [use cases](../ui-library-use-cases.md#chat-use-cases).
 

articles/communication-services/concepts/ui-library/includes/mobile-ui-use-cases.md

@@ -8,7 +8,7 @@ ms.date: 09/14/2021
 
 Use the `CallComposite` and the `ChatComposite` in the Azure Communication Services UI Library to create call experiences in your iOS and Android applications. By using a couple lines of code, you can easily integrate an entire call and chat experience in your application. Composites in Communication Services manage the entire lifecycle of the call and chat, from setup until the call and chat end.
 
-## Calling Use Cases
+## Calling use cases
 
 You can use the call composite in Communication Services to create these use cases:
 
@@ -33,7 +33,7 @@ You can use the call composite in Communication Services to create these use cas
 |                                                                                                 | End a call                                               |
 |                                                                                                 | Hold and resume a call after audio interruption                 |
 
-### Teams Interoperability
+### Teams interoperability
 
 For [Teams interoperability](../../teams-interop.md) scenarios, you can use UI Library composites to add a user to a Teams meeting via Communication Services. To enable Teams interoperability, use the call composite. The composite manages the entire lifecycle of joining a Teams interoperability call.
 
@@ -71,13 +71,13 @@ Localization is key to making products for users around the world and who speak
 
 Accessibility is a key focus of the call libraries. You can use a screen reader to make important announcements about call status and to help ensure that visually impaired users can effectively participate when they use the application.
 
-### View Data Injection
+### View data injection
 
 Use the UI Library for mobile native platforms to give local and remote participants the option to customize how they appear as users in a call. A local participant can choose a local avatar, custom display name, navigation's title and subtitle on Setup screen when a call begins. A remote user can create a customized avatar when they join the meeting. For more information, see [How to customize pre-meeting view](../../../how-tos/ui-library-sdk/data-model.md).
 
 :::image type="content" source="../../media/mobile-ui/ios-composite.gif" alt-text="GIF animation that shows the pre-meeting experience and joining experience on iOS.":::
 
-## Chat Use Cases
+## Chat use cases
 
 [!INCLUDE [Public Preview Notice](../../../includes/public-preview-include.md)]
 
@@ -99,11 +99,11 @@ The `ChatComposite` was designed to fit into different layouts and views in your
 | -------------------------------------------------------- | --------------------------------------------------------------- |
 | :::image type="content" source="../../media/mobile-ui/chat-fullscreen.png" alt-text="an image that shows the chat experience on iOS in a navigation view."::: | :::image type="content" source="../../media/mobile-ui/chat-modal.png" alt-text="an image that shows the chat experience on iOS in a modal view.":::  |
 
-## Supported Identities
+## Supported identities
 
 To initialize a composite and authenticate to the service, a user must have an Azure Communication Services identity. For more information, see [Authenticate to Azure Communication Services](../../authentication.md) and [Quickstart: Create and manage access tokens](../../../quickstarts/access-tokens.md).
 
-## Recommended Architecture
+## Recommended architecture
 
 Initialize a composite by using an Azure Communication Services access token. It's important to get access tokens from Azure Communication Services through a trusted service that you manage. For more information, see [Quickstart: Create and manage access tokens](../../../quickstarts/access-tokens.md) and the [trusted service tutorial](../../../tutorials/trusted-service-tutorial.md).
 
@@ -118,7 +118,7 @@ Call and chat client libraries must have the context for the call they join. Lik
 | Retrieve and pass join information for the call or chat          | Pass through call and chat information to initialize components |
 | Retrieve and pass user information for any custom data model | Pass through a custom data model to components to render          |
 
-## Platform Support
+## Platform support
 
 |Platform | Versions|
 |---------|---------|